Le 12/09/2019 à 19:26, Michal Suchanek a écrit :
There are numerous references to 32bit functions in generic and 64bit
code so ifdef them out.
Signed-off-by: Michal Suchanek <msuchanek@xxxxxxx>
---
v2:
- fix 32bit ifdef condition in signal.c
- simplify the compat ifdef condition in vdso.c - 64bit is redundant
- simplify the compat ifdef condition in callchain.c - 64bit is redundant
v3:
- use IS_ENABLED and maybe_unused where possible
- do not ifdef declarations
- clean up Makefile
v4:
- further makefile cleanup
- simplify is_32bit_task conditions
- avoid ifdef in condition by using return
v5:
- avoid unreachable code on 32bit
- make is_current_64bit constant on !COMPAT
- add stub perf_callchain_user_32 to avoid some ifdefs
v6:
- consolidate current_is_64bit
v7:
- remove leftover perf_callchain_user_32 stub from previous series version
v8:
- fix build again - too trigger-happy with stub removal
- remove a vdso.c hunk that causes warning according to kbuild test robot
---
arch/powerpc/include/asm/thread_info.h | 4 +--
arch/powerpc/kernel/Makefile | 7 ++---
arch/powerpc/kernel/entry_64.S | 2 ++
arch/powerpc/kernel/signal.c | 3 +-
arch/powerpc/kernel/syscall_64.c | 6 ++--
arch/powerpc/kernel/vdso.c | 3 +-
arch/powerpc/perf/callchain.c | 39 ++++++++++++++------------
7 files changed, 33 insertions(+), 31 deletions(-)
diff --git a/arch/powerpc/include/asm/thread_info.h b/arch/powerpc/include/asm/thread_info.h
index 8e1d0195ac36..c128d8a48ea3 100644
--- a/arch/powerpc/include/asm/thread_info.h
+++ b/arch/powerpc/include/asm/thread_info.h
@@ -144,10 +144,10 @@ static inline bool test_thread_local_flags(unsigned int flags)
return (ti->local_flags & flags) != 0;
}
-#ifdef CONFIG_PPC64
+#ifdef CONFIG_COMPAT
#define is_32bit_task() (test_thread_flag(TIF_32BIT))
#else
-#define is_32bit_task() (1)
+#define is_32bit_task() (IS_ENABLED(CONFIG_PPC32))
#endif
#if defined(CONFIG_PPC64)
[...]
+static inline int current_is_64bit(void)
+{
+ if (!IS_ENABLED(CONFIG_COMPAT))
+ return IS_ENABLED(CONFIG_PPC64);
+ /*
+ * We can't use test_thread_flag() here because we may be on an
+ * interrupt stack, and the thread flags don't get copied over
+ * from the thread_info on the main stack to the interrupt stack.
+ */
+ return !test_ti_thread_flag(task_thread_info(current), TIF_32BIT);
+}
Since at least commit ed1cd6deb013 ("powerpc: Activate
CONFIG_THREAD_INFO_IN_TASK")
[https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ed1cd6d]
the above comment is wrong and current_is_64bit() is equivalent to
!is_32bit_task()
See https://github.com/linuxppc/issues/issues/275
Christophe
