Rikard Falkeborn f747e6667e linux/bits.h: fix compilation error with GENMASK ...

GENMASK() has an input check which uses __builtin_choose_expr() to
enable a compile time sanity check of its inputs if they are known at
compile time.

However, it turns out that __builtin_constant_p() does not always return
a compile time constant [0].  It was thought this problem was fixed with
gcc 4.9 [1], but apparently this is not the case [2].

Switch to use __is_constexpr() instead which always returns a compile time
constant, regardless of its inputs.

Link: https://lore.kernel.org/lkml/42b4342b-aefc-a16a-0d43-9f9c0d63ba7a@rasmusvillemoes.dk [0]
Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=19449 [1]
Link: https://lore.kernel.org/lkml/1ac7bbc2-45d9-26ed-0b33-bf382b8d858b@I-love.SAKURA.ne.jp [2]
Link: https://lkml.kernel.org/r/20210511203716.117010-1-rikard.falkeborn@gmail.com
Signed-off-by: Rikard Falkeborn <rikard.falkeborn@gmail.com>
Reported-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: Ard Biesheuvel <ardb@kernel.org>
Cc: Yury Norov <yury.norov@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2021-05-22 15:09:07 -10:00

..

sched

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unaligned

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atomic.h

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bitmap.h

tools: sync small_const_nbits() macro with the kernel

2021-05-06 19:24:12 -07:00

bitops.h

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bits.h

linux/bits.h: fix compilation error with GENMASK

2021-05-22 15:09:07 -10:00

btf_ids.h

btf: Add BTF_ID_LIST_SINGLE macro

2020-09-21 15:00:40 -07:00

bug.h

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build_bug.h

tools headers: Syncronize linux/build_bug.h with the kernel sources

2021-01-15 16:31:46 -03:00

compiler_types.h

tools headers: Add conditional __has_builtin()

2020-12-18 17:32:28 -03:00

compiler-gcc.h

perf tools: Remove broken __no_tail_call attribute

2020-11-03 08:32:15 -03:00

compiler.h

tools headers: Get tools's linux/compiler.h closer to the kernel's

2020-12-18 17:32:26 -03:00

const.h

linux/bits.h: fix compilation error with GENMASK

2021-05-22 15:09:07 -10:00

coresight-pmu.h

tools headers UAPI: Update tools' copy of linux/coresight-pmu.h

2021-03-06 16:54:30 -03:00

ctype.h

tools headers: Update linux/ctype.h with the kernel sources

2020-12-18 17:32:28 -03:00

debug_locks.h

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delay.h

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err.h

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export.h

module: remove EXPORT_UNUSED_SYMBOL*

2021-02-08 12:28:07 +01:00

filter.h

bpf: Add bitwise atomic instructions

2021-01-14 18:34:29 -08:00

ftrace.h

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gfp.h

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hardirq.h

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hash.h

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hashtable.h

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interrupt.h

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irqflags.h

lockdep: Remove lockdep_hardirq{s_enabled,_context}() argument

2020-07-10 12:00:02 +02:00

jhash.h

tools/: replace HTTP links with HTTPS ones

2020-08-07 11:33:21 -07:00

kallsyms.h

kallsyms/printk: add loglvl to print_ip_sym()

2020-06-09 09:39:10 -07:00

kconfig.h

x86/insn: Add an insn_decode() API

2021-03-15 11:05:47 +01:00

kern_levels.h

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kernel.h

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linkage.h

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list.h

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lockdep.h

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log2.h

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math64.h

tools include: Add an initial math64.h

2021-04-15 16:38:02 -03:00

module.h

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mutex.h

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nmi.h

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numa.h

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objtool.h

objtool: Combine UNWIND_HINT_RET_OFFSET and UNWIND_HINT_FUNC

2021-01-26 11:12:00 -06:00

overflow.h

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poison.h

mm, page_poison: remove CONFIG_PAGE_POISONING_ZERO

2020-12-15 12:13:46 -08:00

proc_fs.h

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rbtree_augmented.h

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rbtree.h

rbtree: Add generic add and find helpers

2021-02-17 14:07:31 +01:00

rcu.h

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refcount.h

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ring_buffer.h

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seq_file.h

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sizes.h

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spinlock.h

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stacktrace.h

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static_call_types.h

static_call: Move struct static_call_key definition to static_call_types.h

2021-03-11 16:04:39 +01:00

string.h

tools lib: Adopt memchr_inv() from kernel

2020-11-27 08:34:52 -03:00

stringify.h

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time64.h

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types.h

tools include: Add __sum16 and __wsum definitions.

2021-03-08 10:42:03 -03:00

zalloc.h

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