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    Subject[PATCH 5.15 113/779] arm64: Do not forget syscall when starting a new thread.
    Date
    From: Francis Laniel <flaniel@linux.microsoft.com>

    [ Upstream commit de6921856f99c11d3986c6702d851e1328d4f7f6 ]

    Enable tracing of the execve*() system calls with the
    syscalls:sys_exit_execve tracepoint by removing the call to
    forget_syscall() when starting a new thread and preserving the value of
    regs->syscallno across exec.

    Signed-off-by: Francis Laniel <flaniel@linux.microsoft.com>
    Link: https://lore.kernel.org/r/20220608162447.666494-2-flaniel@linux.microsoft.com
    Signed-off-by: Will Deacon <will@kernel.org>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    arch/arm64/include/asm/processor.h | 3 ++-
    1 file changed, 2 insertions(+), 1 deletion(-)

    diff --git a/arch/arm64/include/asm/processor.h b/arch/arm64/include/asm/processor.h
    index 5e73d7f7d1e7..d9bf3d12a2b8 100644
    --- a/arch/arm64/include/asm/processor.h
    +++ b/arch/arm64/include/asm/processor.h
    @@ -204,8 +204,9 @@ void tls_preserve_current_state(void);

    static inline void start_thread_common(struct pt_regs *regs, unsigned long pc)
    {
    + s32 previous_syscall = regs->syscallno;
    memset(regs, 0, sizeof(*regs));
    - forget_syscall(regs);
    + regs->syscallno = previous_syscall;
    regs->pc = pc;

    if (system_uses_irq_prio_masking())
    --
    2.35.1


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