[PATCH v10 27/27] mm: display pkey in smaps if arch_pkeys_enabled() is true
From: Ram Pai <hidden>
Date: 2018-01-19 01:53:12
Also in:
linux-arch, linux-kselftest, linux-mm, lkml
Subsystem:
filesystems (vfs and infrastructure), memory mapping, proc filesystem, the rest, x86 architecture (32-bit and 64-bit) · Maintainers:
Alexander Viro, Christian Brauner, Andrew Morton, Liam R. Howlett, Lorenzo Stoakes, Linus Torvalds, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen
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. x86 arch_show_smap() function is not needed anymore. Delete it. Signed-off-by: Ram Pai <redacted> --- arch/x86/kernel/setup.c | 8 -------- fs/proc/task_mmu.c | 11 ++++++----- 2 files changed, 6 insertions(+), 13 deletions(-)
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 8af2e8d..ddf945a 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c@@ -1326,11 +1326,3 @@ 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)); -}
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 0edd4da..4b39a94 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c@@ -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>
@@ -728,10 +729,6 @@ 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) -{ -} - static int show_smap(struct seq_file *m, void *v, int is_pid) { struct proc_maps_private *priv = m->private;
@@ -851,9 +848,13 @@ static int show_smap(struct seq_file *m, void *v, int is_pid) (unsigned long)(mss->pss >> (10 + PSS_SHIFT))); if (!rollup_mode) { - arch_show_smap(m, vma); +#ifdef CONFIG_ARCH_HAS_PKEYS + if (arch_pkeys_enabled()) + seq_printf(m, "ProtectionKey: %8u\n", vma_pkey(vma)); +#endif show_smap_vma_flags(m, vma); } + m_cache_vma(m, vma); return ret; }
--
1.7.1