[PATCH v2 07/17] mm: Define VM_DROPPABLE for powerpc/32
From: Christophe Leroy <hidden>
Date: 2024-08-22 07:14:01
Also in:
linux-arch, linux-fsdevel, linux-kselftest, linux-mm, linuxppc-dev, lkml
Subsystem:
filesystems (vfs and infrastructure), memory management - core, memory mapping, proc filesystem, the rest, tracing · Maintainers:
Alexander Viro, Christian Brauner, Andrew Morton, David Hildenbrand, Liam R. Howlett, Lorenzo Stoakes, Linus Torvalds, Steven Rostedt, Masami Hiramatsu
Commit 9651fcedf7b9 ("mm: add MAP_DROPPABLE for designating always
lazily freeable mappings") only adds VM_DROPPABLE for 64 bits
architectures.
In order to also use the getrandom vDSO implementation on powerpc/32,
use VM_ARCH_1 for VM_DROPPABLE on powerpc/32. This is possible because
VM_ARCH_1 is used for VM_SAO on powerpc and VM_SAO is only for
powerpc/64.
Signed-off-by: Christophe Leroy <redacted>
---
fs/proc/task_mmu.c | 4 +++-
include/linux/mm.h | 4 +++-
include/trace/events/mmflags.h | 4 ++--
3 files changed, 8 insertions(+), 4 deletions(-)
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 5f171ad7b436..4a3fe961cbf6 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c@@ -987,8 +987,10 @@ static void show_smap_vma_flags(struct seq_file *m, struct vm_area_struct *vma) #ifdef CONFIG_X86_USER_SHADOW_STACK [ilog2(VM_SHADOW_STACK)] = "ss", #endif -#ifdef CONFIG_64BIT +#if VM_DROPPABLE != VM_NONE [ilog2(VM_DROPPABLE)] = "dp", +#endif +#ifdef CONFIG_64BIT [ilog2(VM_SEALED)] = "sl", #endif };
diff --git a/include/linux/mm.h b/include/linux/mm.h
index c4b238a20b76..865d3e21ee5e 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h@@ -359,7 +359,7 @@ extern unsigned int kobjsize(const void *objp); #if defined(CONFIG_X86) # define VM_PAT VM_ARCH_1 /* PAT reserves whole VMA at once (x86) */ -#elif defined(CONFIG_PPC) +#elif defined(CONFIG_PPC64) # define VM_SAO VM_ARCH_1 /* Strong Access Ordering (powerpc) */ #elif defined(CONFIG_PARISC) # define VM_GROWSUP VM_ARCH_1
@@ -409,6 +409,8 @@ extern unsigned int kobjsize(const void *objp); #ifdef CONFIG_64BIT #define VM_DROPPABLE_BIT 40 #define VM_DROPPABLE BIT(VM_DROPPABLE_BIT) +#elif defined(CONFIG_PPC32) +#define VM_DROPPABLE VM_ARCH_1 #else #define VM_DROPPABLE VM_NONE #endif
diff --git a/include/trace/events/mmflags.h b/include/trace/events/mmflags.h
index b63d211bd141..9820cbfbcb14 100644
--- a/include/trace/events/mmflags.h
+++ b/include/trace/events/mmflags.h@@ -143,7 +143,7 @@ IF_HAVE_PG_ARCH_X(arch_3) #if defined(CONFIG_X86) #define __VM_ARCH_SPECIFIC_1 {VM_PAT, "pat" } -#elif defined(CONFIG_PPC) +#elif defined(CONFIG_PPC64) #define __VM_ARCH_SPECIFIC_1 {VM_SAO, "sao" } #elif defined(CONFIG_PARISC) #define __VM_ARCH_SPECIFIC_1 {VM_GROWSUP, "growsup" }
@@ -165,7 +165,7 @@ IF_HAVE_PG_ARCH_X(arch_3) # define IF_HAVE_UFFD_MINOR(flag, name) #endif -#ifdef CONFIG_64BIT +#if VM_DROPPABLE != VM_NONE # define IF_HAVE_VM_DROPPABLE(flag, name) {flag, name}, #else # define IF_HAVE_VM_DROPPABLE(flag, name)
--
2.44.0