Re: [PATCH v12 5/8] powerpc/64: make buildable without CONFIG_COMPAT
From: Christophe Leroy <hidden>
Date: 2020-04-07 05:50:42
Also in:
linux-fsdevel, lkml
Le 20/03/2020 à 11:20, 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 <redacted> --- 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 v9: - removed current_is_64bit in previous patch v10: - rebase on top of 70ed86f4de5bd --- arch/powerpc/include/asm/thread_info.h | 4 ++-- arch/powerpc/kernel/Makefile | 6 +++--- 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 | 8 +++++++- 7 files changed, 19 insertions(+), 13 deletions(-)
[...]
quoted hunk ↗ jump to hunk
diff --git a/arch/powerpc/kernel/syscall_64.c b/arch/powerpc/kernel/syscall_64.c index 87d95b455b83..2dcbfe38f5ac 100644 --- a/arch/powerpc/kernel/syscall_64.c +++ b/arch/powerpc/kernel/syscall_64.c@@ -24,7 +24,6 @@ notrace long system_call_exception(long r3, long r4, long r5, long r6, long r7, long r8, unsigned long r0, struct pt_regs *regs) { - unsigned long ti_flags; syscall_fn f; if (IS_ENABLED(CONFIG_PPC_IRQ_SOFT_MASK_DEBUG))@@ -68,8 +67,7 @@ notrace long system_call_exception(long r3, long r4, long r5, local_irq_enable(); - ti_flags = current_thread_info()->flags; - if (unlikely(ti_flags & _TIF_SYSCALL_DOTRACE)) { + if (unlikely(current_thread_info()->flags & _TIF_SYSCALL_DOTRACE)) { /* * We use the return value of do_syscall_trace_enter() as the * syscall number. If the syscall was rejected for any reason@@ -94,7 +92,7 @@ notrace long system_call_exception(long r3, long r4, long r5, /* May be faster to do array_index_nospec? */ barrier_nospec(); - if (unlikely(ti_flags & _TIF_32BIT)) { + if (unlikely(is_32bit_task())) {
is_compat() should be used here instead, because we dont want to use compat_sys_call_table() on PPC32.
f = (void *)compat_sys_call_table[r0]; r3 &= 0x00000000ffffffffULL;
Christophe