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linux/lib/dhry_1.c
Geert Uytterhoeven 8ba388c06b lib: dhry: fix sleeping allocations inside non-preemptable section 
The Smatch static checker reports the following warnings:

    lib/dhry_run.c:38 dhry_benchmark() warn: sleeping in atomic context
    lib/dhry_run.c:43 dhry_benchmark() warn: sleeping in atomic context

Indeed, dhry() does sleeping allocations inside the non-preemptable
section delimited by get_cpu()/put_cpu().

Fix this by using atomic allocations instead.
Add error handling, as atomic these allocations may fail.

Link: https://lkml.kernel.org/r/bac6d517818a7cd8efe217c1ad649fffab9cc371.1688568764.git.geert+renesas@glider.be
Fixes: 13684e966d ("lib: dhry: fix unstable smp_processor_id(_) usage")
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Closes: https://lore.kernel.org/r/0469eb3a-02eb-4b41-b189-de20b931fa56@moroto.mountain
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2023-07-08 09:29:32 -07:00

291 lines
7.9 KiB
C
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// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
/*
****************************************************************************
*
* "DHRYSTONE" Benchmark Program
* -----------------------------
*
* Version: C, Version 2.1
*
* File: dhry_1.c (part 2 of 3)
*
* Date: May 25, 1988
*
* Author: Reinhold P. Weicker
*
****************************************************************************
*/
#include "dhry.h"
#include <linux/ktime.h>
#include <linux/slab.h>
#include <linux/string.h>
/* Global Variables: */
int Int_Glob;
char Ch_1_Glob;
static Rec_Pointer Ptr_Glob, Next_Ptr_Glob;
static Boolean Bool_Glob;
static char Ch_2_Glob;
static int Arr_1_Glob[50];
static int Arr_2_Glob[50][50];
static void Proc_3(Rec_Pointer *Ptr_Ref_Par)
/******************/
/* executed once */
/* Ptr_Ref_Par becomes Ptr_Glob */
{
if (Ptr_Glob) {
/* then, executed */
*Ptr_Ref_Par = Ptr_Glob->Ptr_Comp;
}
Proc_7(10, Int_Glob, &Ptr_Glob->variant.var_1.Int_Comp);
} /* Proc_3 */
static void Proc_1(Rec_Pointer Ptr_Val_Par)
/******************/
/* executed once */
{
Rec_Pointer Next_Record = Ptr_Val_Par->Ptr_Comp;
/* == Ptr_Glob_Next */
/* Local variable, initialized with Ptr_Val_Par->Ptr_Comp, */
/* corresponds to "rename" in Ada, "with" in Pascal */
*Ptr_Val_Par->Ptr_Comp = *Ptr_Glob;
Ptr_Val_Par->variant.var_1.Int_Comp = 5;
Next_Record->variant.var_1.Int_Comp =
Ptr_Val_Par->variant.var_1.Int_Comp;
Next_Record->Ptr_Comp = Ptr_Val_Par->Ptr_Comp;
Proc_3(&Next_Record->Ptr_Comp);
/* Ptr_Val_Par->Ptr_Comp->Ptr_Comp == Ptr_Glob->Ptr_Comp */
if (Next_Record->Discr == Ident_1) {
/* then, executed */
Next_Record->variant.var_1.Int_Comp = 6;
Proc_6(Ptr_Val_Par->variant.var_1.Enum_Comp,
&Next_Record->variant.var_1.Enum_Comp);
Next_Record->Ptr_Comp = Ptr_Glob->Ptr_Comp;
Proc_7(Next_Record->variant.var_1.Int_Comp, 10,
&Next_Record->variant.var_1.Int_Comp);
} else {
/* not executed */
*Ptr_Val_Par = *Ptr_Val_Par->Ptr_Comp;
}
} /* Proc_1 */
static void Proc_2(One_Fifty *Int_Par_Ref)
/******************/
/* executed once */
/* *Int_Par_Ref == 1, becomes 4 */
{
One_Fifty Int_Loc;
Enumeration Enum_Loc;
Int_Loc = *Int_Par_Ref + 10;
do {
/* executed once */
if (Ch_1_Glob == 'A') {
/* then, executed */
Int_Loc -= 1;
*Int_Par_Ref = Int_Loc - Int_Glob;
Enum_Loc = Ident_1;
} /* if */
} while (Enum_Loc != Ident_1); /* true */
} /* Proc_2 */
static void Proc_4(void)
/*******/
/* executed once */
{
Boolean Bool_Loc;
Bool_Loc = Ch_1_Glob == 'A';
Bool_Glob = Bool_Loc | Bool_Glob;
Ch_2_Glob = 'B';
} /* Proc_4 */
static void Proc_5(void)
/*******/
/* executed once */
{
Ch_1_Glob = 'A';
Bool_Glob = false;
} /* Proc_5 */
int dhry(int n)
/*****/
/* main program, corresponds to procedures */
/* Main and Proc_0 in the Ada version */
{
One_Fifty Int_1_Loc;
One_Fifty Int_2_Loc;
One_Fifty Int_3_Loc;
char Ch_Index;
Enumeration Enum_Loc;
Str_30 Str_1_Loc;
Str_30 Str_2_Loc;
int Run_Index;
int Number_Of_Runs;
ktime_t Begin_Time, End_Time;
u32 User_Time;
/* Initializations */
Next_Ptr_Glob = (Rec_Pointer)kzalloc(sizeof(Rec_Type), GFP_ATOMIC);
if (!Next_Ptr_Glob)
return -ENOMEM;
Ptr_Glob = (Rec_Pointer)kzalloc(sizeof(Rec_Type), GFP_ATOMIC);
if (!Ptr_Glob) {
kfree(Next_Ptr_Glob);
return -ENOMEM;
}
Ptr_Glob->Ptr_Comp = Next_Ptr_Glob;
Ptr_Glob->Discr = Ident_1;
Ptr_Glob->variant.var_1.Enum_Comp = Ident_3;
Ptr_Glob->variant.var_1.Int_Comp = 40;
strcpy(Ptr_Glob->variant.var_1.Str_Comp,
"DHRYSTONE PROGRAM, SOME STRING");
strcpy(Str_1_Loc, "DHRYSTONE PROGRAM, 1'ST STRING");
Arr_2_Glob[8][7] = 10;
/* Was missing in published program. Without this statement, */
/* Arr_2_Glob[8][7] would have an undefined value. */
/* Warning: With 16-Bit processors and Number_Of_Runs > 32000, */
/* overflow may occur for this array element. */
pr_debug("Dhrystone Benchmark, Version 2.1 (Language: C)\n");
Number_Of_Runs = n;
pr_debug("Execution starts, %d runs through Dhrystone\n",
Number_Of_Runs);
/***************/
/* Start timer */
/***************/
Begin_Time = ktime_get();
for (Run_Index = 1; Run_Index <= Number_Of_Runs; ++Run_Index) {
Proc_5();
Proc_4();
/* Ch_1_Glob == 'A', Ch_2_Glob == 'B', Bool_Glob == true */
Int_1_Loc = 2;
Int_2_Loc = 3;
strcpy(Str_2_Loc, "DHRYSTONE PROGRAM, 2'ND STRING");
Enum_Loc = Ident_2;
Bool_Glob = !Func_2(Str_1_Loc, Str_2_Loc);
/* Bool_Glob == 1 */
while (Int_1_Loc < Int_2_Loc) {
/* loop body executed once */
Int_3_Loc = 5 * Int_1_Loc - Int_2_Loc;
/* Int_3_Loc == 7 */
Proc_7(Int_1_Loc, Int_2_Loc, &Int_3_Loc);
/* Int_3_Loc == 7 */
Int_1_Loc += 1;
} /* while */
/* Int_1_Loc == 3, Int_2_Loc == 3, Int_3_Loc == 7 */
Proc_8(Arr_1_Glob, Arr_2_Glob, Int_1_Loc, Int_3_Loc);
/* Int_Glob == 5 */
Proc_1(Ptr_Glob);
for (Ch_Index = 'A'; Ch_Index <= Ch_2_Glob; ++Ch_Index) {
/* loop body executed twice */
if (Enum_Loc == Func_1(Ch_Index, 'C')) {
/* then, not executed */
Proc_6(Ident_1, &Enum_Loc);
strcpy(Str_2_Loc, "DHRYSTONE PROGRAM, 3'RD STRING");
Int_2_Loc = Run_Index;
Int_Glob = Run_Index;
}
}
/* Int_1_Loc == 3, Int_2_Loc == 3, Int_3_Loc == 7 */
Int_2_Loc = Int_2_Loc * Int_1_Loc;
Int_1_Loc = Int_2_Loc / Int_3_Loc;
Int_2_Loc = 7 * (Int_2_Loc - Int_3_Loc) - Int_1_Loc;
/* Int_1_Loc == 1, Int_2_Loc == 13, Int_3_Loc == 7 */
Proc_2(&Int_1_Loc);
/* Int_1_Loc == 5 */
} /* loop "for Run_Index" */
/**************/
/* Stop timer */
/**************/
End_Time = ktime_get();
#define dhry_assert_int_eq(val, expected) \
if (val != expected) \
pr_err("%s: %d (FAIL, expected %d)\n", #val, val, \
expected); \
else \
pr_debug("%s: %d (OK)\n", #val, val)
#define dhry_assert_char_eq(val, expected) \
if (val != expected) \
pr_err("%s: %c (FAIL, expected %c)\n", #val, val, \
expected); \
else \
pr_debug("%s: %c (OK)\n", #val, val)
#define dhry_assert_string_eq(val, expected) \
if (strcmp(val, expected)) \
pr_err("%s: %s (FAIL, expected %s)\n", #val, val, \
expected); \
else \
pr_debug("%s: %s (OK)\n", #val, val)
pr_debug("Execution ends\n");
pr_debug("Final values of the variables used in the benchmark:\n");
dhry_assert_int_eq(Int_Glob, 5);
dhry_assert_int_eq(Bool_Glob, 1);
dhry_assert_char_eq(Ch_1_Glob, 'A');
dhry_assert_char_eq(Ch_2_Glob, 'B');
dhry_assert_int_eq(Arr_1_Glob[8], 7);
dhry_assert_int_eq(Arr_2_Glob[8][7], Number_Of_Runs + 10);
pr_debug("Ptr_Comp: %px\n", Ptr_Glob->Ptr_Comp);
dhry_assert_int_eq(Ptr_Glob->Discr, 0);
dhry_assert_int_eq(Ptr_Glob->variant.var_1.Enum_Comp, 2);
dhry_assert_int_eq(Ptr_Glob->variant.var_1.Int_Comp, 17);
dhry_assert_string_eq(Ptr_Glob->variant.var_1.Str_Comp,
"DHRYSTONE PROGRAM, SOME STRING");
if (Next_Ptr_Glob->Ptr_Comp != Ptr_Glob->Ptr_Comp)
pr_err("Next_Ptr_Glob->Ptr_Comp: %px (expected %px)\n",
Next_Ptr_Glob->Ptr_Comp, Ptr_Glob->Ptr_Comp);
else
pr_debug("Next_Ptr_Glob->Ptr_Comp: %px\n",
Next_Ptr_Glob->Ptr_Comp);
dhry_assert_int_eq(Next_Ptr_Glob->Discr, 0);
dhry_assert_int_eq(Next_Ptr_Glob->variant.var_1.Enum_Comp, 1);
dhry_assert_int_eq(Next_Ptr_Glob->variant.var_1.Int_Comp, 18);
dhry_assert_string_eq(Next_Ptr_Glob->variant.var_1.Str_Comp,
"DHRYSTONE PROGRAM, SOME STRING");
dhry_assert_int_eq(Int_1_Loc, 5);
dhry_assert_int_eq(Int_2_Loc, 13);
dhry_assert_int_eq(Int_3_Loc, 7);
dhry_assert_int_eq(Enum_Loc, 1);
dhry_assert_string_eq(Str_1_Loc, "DHRYSTONE PROGRAM, 1'ST STRING");
dhry_assert_string_eq(Str_2_Loc, "DHRYSTONE PROGRAM, 2'ND STRING");
User_Time = ktime_to_ms(ktime_sub(End_Time, Begin_Time));
kfree(Ptr_Glob);
kfree(Next_Ptr_Glob);
/* Measurements should last at least 2 seconds */
if (User_Time < 2 * MSEC_PER_SEC)
return -EAGAIN;
return div_u64(mul_u32_u32(MSEC_PER_SEC, Number_Of_Runs), User_Time);
}
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