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s390/vmem: remove unnecessary KASAN checks

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Kasan shadow memory area has been moved to the end of kernel address
space since commit 9a39abb7c9 ("s390/boot: simplify and fix kernel
memory layout setup"), therefore skipping any memory ranges above
VMALLOC_START in empty page tables cleanup code already handles
KASAN shadow memory intersection case and explicit checks could be
removed.

Reviewed-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Vasily Gorbik 2023-01-28 18:06:40 +01:00 committed by Heiko Carstens
parent 108303b0a2
commit fb9293b9f3
1 changed files with 1 additions and 12 deletions
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13
arch/s390/mm/vmem.c
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@ -297,10 +297,7 @@ static void try_free_pmd_table(pud_t *pud, unsigned long start)
/* Don't mess with any tables not fully in 1:1 mapping & vmemmap area */
if (end > VMALLOC_START)
return;
#ifdef CONFIG_KASAN
if (start < KASAN_SHADOW_END && end > KASAN_SHADOW_START)
return;
#endif
pmd = pmd_offset(pud, start);
for (i = 0; i < PTRS_PER_PMD; i++, pmd++)
if (!pmd_none(*pmd))
@ -372,10 +369,6 @@ static void try_free_pud_table(p4d_t *p4d, unsigned long start)
/* Don't mess with any tables not fully in 1:1 mapping & vmemmap area */
if (end > VMALLOC_START)
return;
#ifdef CONFIG_KASAN
if (start < KASAN_SHADOW_END && end > KASAN_SHADOW_START)
return;
#endif
pud = pud_offset(p4d, start);
for (i = 0; i < PTRS_PER_PUD; i++, pud++) {
@ -426,10 +419,6 @@ static void try_free_p4d_table(pgd_t *pgd, unsigned long start)
/* Don't mess with any tables not fully in 1:1 mapping & vmemmap area */
if (end > VMALLOC_START)
return;
#ifdef CONFIG_KASAN
if (start < KASAN_SHADOW_END && end > KASAN_SHADOW_START)
return;
#endif
p4d = p4d_offset(pgd, start);
for (i = 0; i < PTRS_PER_P4D; i++, p4d++) {