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| author | Michal Suchanek <msuchanek@suse.de> | 2020-03-20 11:20:15 +0100 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-04-03 00:10:00 +1100 |
| commit | 2910428106ebf23a9a2176cb751749edb2ce57e2 (patch) | |
| tree | 70e884a3b91af6f0d4bc0b95d60fbee583355a33 /arch/powerpc/perf/callchain.c | |
| parent | d6c19bdee2ba3d9426d31cb82d036212c3b2fb47 (diff) | |
| download | linux-2910428106ebf23a9a2176cb751749edb2ce57e2.tar.bz2 | |
powerpc/perf: consolidate valid_user_sp -> invalid_user_sp
Merge the 32bit and 64bit version.
Halve the check constants on 32bit.
Use STACK_TOP since it is defined.
Passing is_64 is now redundant since is_32bit_task() is used to
determine which callchain variant should be used. Use STACK_TOP and
is_32bit_task() directly.
This removes a page from the valid 32bit area on 64bit:
#define TASK_SIZE_USER32 (0x0000000100000000UL - (1 * PAGE_SIZE))
#define STACK_TOP_USER32 TASK_SIZE_USER32
Change return value to bool. It is inverted by users anyway.
Change to invalid_user_sp to avoid inverting the return value twice.
Signed-off-by: Michal Suchanek <msuchanek@suse.de>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/be8e40fc0737fb28ad08b198552dee7cac1c5ce2.1584699455.git.msuchanek@suse.de
Diffstat (limited to 'arch/powerpc/perf/callchain.c')
| -rw-r--r-- | arch/powerpc/perf/callchain.c | 26 |
1 files changed, 10 insertions, 16 deletions
diff --git a/arch/powerpc/perf/callchain.c b/arch/powerpc/perf/callchain.c index c9a78c6e4361..001d0473a61f 100644 --- a/arch/powerpc/perf/callchain.c +++ b/arch/powerpc/perf/callchain.c @@ -102,6 +102,14 @@ perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, struct pt_regs *re } } +static inline bool invalid_user_sp(unsigned long sp) +{ + unsigned long mask = is_32bit_task() ? 3 : 7; + unsigned long top = STACK_TOP - (is_32bit_task() ? 16 : 32); + + return (!sp || (sp & mask) || (sp > top)); +} + #ifdef CONFIG_PPC64 /* * On 64-bit we don't want to invoke hash_page on user addresses from @@ -161,13 +169,6 @@ static int read_user_stack_64(unsigned long __user *ptr, unsigned long *ret) return read_user_stack_slow(ptr, ret, 8); } -static inline int valid_user_sp(unsigned long sp, int is_64) -{ - if (!sp || (sp & 7) || sp > (is_64 ? TASK_SIZE : 0x100000000UL) - 32) - return 0; - return 1; -} - /* * 64-bit user processes use the same stack frame for RT and non-RT signals. */ @@ -226,7 +227,7 @@ static void perf_callchain_user_64(struct perf_callchain_entry_ctx *entry, while (entry->nr < entry->max_stack) { fp = (unsigned long __user *) sp; - if (!valid_user_sp(sp, 1) || read_user_stack_64(fp, &next_sp)) + if (invalid_user_sp(sp) || read_user_stack_64(fp, &next_sp)) return; if (level > 0 && read_user_stack_64(&fp[2], &next_ip)) return; @@ -275,13 +276,6 @@ static inline void perf_callchain_user_64(struct perf_callchain_entry_ctx *entry { } -static inline int valid_user_sp(unsigned long sp, int is_64) -{ - if (!sp || (sp & 7) || sp > TASK_SIZE - 32) - return 0; - return 1; -} - #define __SIGNAL_FRAMESIZE32 __SIGNAL_FRAMESIZE #define sigcontext32 sigcontext #define mcontext32 mcontext @@ -423,7 +417,7 @@ static void perf_callchain_user_32(struct perf_callchain_entry_ctx *entry, while (entry->nr < entry->max_stack) { fp = (unsigned int __user *) (unsigned long) sp; - if (!valid_user_sp(sp, 0) || read_user_stack_32(fp, &next_sp)) + if (invalid_user_sp(sp) || read_user_stack_32(fp, &next_sp)) return; if (level > 0 && read_user_stack_32(&fp[1], &next_ip)) return; |