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mm/pkeys, x86, powerpc: Display pkey in smaps if arch supports pkeys

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Currently the architecture specific code is expected to display the
protection keys in smap for a given vma. This can lead to redundant
code and possibly to divergent formats in which the key gets
displayed.

This patch changes the implementation. It displays the pkey only if
the architecture support pkeys, i.e arch_pkeys_enabled() returns true.

x86 arch_show_smap() function is not needed anymore, delete it.

Signed-off-by: Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com>
Signed-off-by: Ram Pai <linuxram@us.ibm.com>
[mpe: Split out from larger patch, rebased on header changes]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Reviewed-by: Dave Hansen <dave.hansen@intel.com>
This commit is contained in:
Ram Pai 2018-04-13 23:55:07 +10:00 committed by Michael Ellerman
parent 4414ef9536
commit 27cca866e3
2 changed files with 3 additions and 13 deletions
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8
arch/x86/kernel/setup.c
View File

@ -1312,11 +1312,3 @@ static int __init register_kernel_offset_dumper(void)
return 0;
}
__initcall(register_kernel_offset_dumper);
void arch_show_smap(struct seq_file *m, struct vm_area_struct *vma)
{
if (!boot_cpu_has(X86_FEATURE_OSPKE))
return;
seq_printf(m, "ProtectionKey: %8u\n", vma_pkey(vma));
}

8
fs/proc/task_mmu.c
View File

@ -18,6 +18,7 @@
#include <linux/page_idle.h>
#include <linux/shmem_fs.h>
#include <linux/uaccess.h>
#include <linux/pkeys.h>
#include <asm/elf.h>
#include <asm/tlb.h>
@ -730,10 +731,6 @@ static int smaps_hugetlb_range(pte_t *pte, unsigned long hmask,
}
#endif /* HUGETLB_PAGE */
void __weak arch_show_smap(struct seq_file *m, struct vm_area_struct *vma)
{
}
#define SEQ_PUT_DEC(str, val) \
seq_put_decimal_ull_width(m, str, (val) >> 10, 8)
static int show_smap(struct seq_file *m, void *v, int is_pid)
@ -838,7 +835,8 @@ static int show_smap(struct seq_file *m, void *v, int is_pid)
seq_puts(m, " kB\n");
}
if (!rollup_mode) {
arch_show_smap(m, vma);
if (arch_pkeys_enabled())
seq_printf(m, "ProtectionKey: %8u\n", vma_pkey(vma));
show_smap_vma_flags(m, vma);
}
m_cache_vma(m, vma);