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authorLinus Torvalds <torvalds@linux-foundation.org>2023-06-24 10:55:38 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2023-06-24 14:12:58 -0700
commita050ba1e7422f2cc60ff8bfde3f96d34d00cb585 (patch)
tree7592f0904d036acae7168daa3cfc2e276417173d /arch/sh
parent8b35ca3e45e35a26a21427f35d4093606e93ad0a (diff)
mm/fault: convert remaining simple cases to lock_mm_and_find_vma()
This does the simple pattern conversion of alpha, arc, csky, hexagon, loongarch, nios2, sh, sparc32, and xtensa to the lock_mm_and_find_vma() helper. They all have the regular fault handling pattern without odd special cases. The remaining architectures all have something that keeps us from a straightforward conversion: ia64 and parisc have stacks that can grow both up as well as down (and ia64 has special address region checks). And m68k, microblaze, openrisc, sparc64, and um end up having extra rules about only expanding the stack down a limited amount below the user space stack pointer. That is something that x86 used to do too (long long ago), and it probably could just be skipped, but it still makes the conversion less than trivial. Note that this conversion was done manually and with the exception of alpha without any build testing, because I have a fairly limited cross- building environment. The cases are all simple, and I went through the changes several times, but... Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/sh')
-rw-r--r--arch/sh/Kconfig1
-rw-r--r--arch/sh/mm/fault.c17
2 files changed, 3 insertions, 15 deletions
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index 9652d367fc37..393023d09245 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -59,6 +59,7 @@ config SUPERH
select HAVE_STACKPROTECTOR
select HAVE_SYSCALL_TRACEPOINTS
select IRQ_FORCED_THREADING
+ select LOCK_MM_AND_FIND_VMA
select MODULES_USE_ELF_RELA
select NEED_SG_DMA_LENGTH
select NO_DMA if !MMU && !DMA_COHERENT
diff --git a/arch/sh/mm/fault.c b/arch/sh/mm/fault.c
index acd2f5e50bfc..06e6b4952924 100644
--- a/arch/sh/mm/fault.c
+++ b/arch/sh/mm/fault.c
@@ -439,21 +439,9 @@ asmlinkage void __kprobes do_page_fault(struct pt_regs *regs,
}
retry:
- mmap_read_lock(mm);
-
- vma = find_vma(mm, address);
+ vma = lock_mm_and_find_vma(mm, address, regs);
if (unlikely(!vma)) {
- bad_area(regs, error_code, address);
- return;
- }
- if (likely(vma->vm_start <= address))
- goto good_area;
- if (unlikely(!(vma->vm_flags & VM_GROWSDOWN))) {
- bad_area(regs, error_code, address);
- return;
- }
- if (unlikely(expand_stack(vma, address))) {
- bad_area(regs, error_code, address);
+ bad_area_nosemaphore(regs, error_code, address);
return;
}
@@ -461,7 +449,6 @@ retry:
* Ok, we have a good vm_area for this memory access, so
* we can handle it..
*/
-good_area:
if (unlikely(access_error(error_code, vma))) {
bad_area_access_error(regs, error_code, address);
return;