From f9f3f02db98bbe678a8e57fe9432b196174744a3 Mon Sep 17 00:00:00 2001 From: John Ogness Date: Wed, 3 Mar 2021 11:15:25 +0100 Subject: printk: introduce a kmsg_dump iterator Rather than storing the iterator information in the registered kmsg_dumper structure, create a separate iterator structure. The kmsg_dump_iter structure can reside on the stack of the caller, thus allowing lockless use of the kmsg_dump functions. Update code that accesses the kernel logs using the kmsg_dumper structure to use the new kmsg_dump_iter structure. For kmsg_dumpers, this also means adding a call to kmsg_dump_rewind() to initialize the iterator. All this is in preparation for removal of @logbuf_lock. Signed-off-by: John Ogness Reviewed-by: Kees Cook # pstore Reviewed-by: Petr Mladek Signed-off-by: Petr Mladek Link: https://lore.kernel.org/r/20210303101528.29901-13-john.ogness@linutronix.de --- arch/powerpc/kernel/nvram_64.c | 8 +++++--- arch/powerpc/xmon/xmon.c | 6 +++--- 2 files changed, 8 insertions(+), 6 deletions(-) (limited to 'arch/powerpc') diff --git a/arch/powerpc/kernel/nvram_64.c b/arch/powerpc/kernel/nvram_64.c index 532f22637783..3c8d9bbb51cf 100644 --- a/arch/powerpc/kernel/nvram_64.c +++ b/arch/powerpc/kernel/nvram_64.c @@ -647,6 +647,7 @@ static void oops_to_nvram(struct kmsg_dumper *dumper, { struct oops_log_info *oops_hdr = (struct oops_log_info *)oops_buf; static unsigned int oops_count = 0; + static struct kmsg_dump_iter iter; static bool panicking = false; static DEFINE_SPINLOCK(lock); unsigned long flags; @@ -681,13 +682,14 @@ static void oops_to_nvram(struct kmsg_dumper *dumper, return; if (big_oops_buf) { - kmsg_dump_get_buffer(dumper, false, + kmsg_dump_rewind(&iter); + kmsg_dump_get_buffer(&iter, false, big_oops_buf, big_oops_buf_sz, &text_len); rc = zip_oops(text_len); } if (rc != 0) { - kmsg_dump_rewind(dumper); - kmsg_dump_get_buffer(dumper, false, + kmsg_dump_rewind(&iter); + kmsg_dump_get_buffer(&iter, false, oops_data, oops_data_sz, &text_len); err_type = ERR_TYPE_KERNEL_PANIC; oops_hdr->version = cpu_to_be16(OOPS_HDR_VERSION); diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c index a777573a0c38..dbcf403b1d8d 100644 --- a/arch/powerpc/xmon/xmon.c +++ b/arch/powerpc/xmon/xmon.c @@ -3005,7 +3005,7 @@ print_address(unsigned long addr) static void dump_log_buf(void) { - struct kmsg_dumper dumper; + struct kmsg_dump_iter iter; unsigned char buf[128]; size_t len; @@ -3017,9 +3017,9 @@ dump_log_buf(void) catch_memory_errors = 1; sync(); - kmsg_dump_rewind_nolock(&dumper); + kmsg_dump_rewind_nolock(&iter); xmon_start_pagination(); - while (kmsg_dump_get_line_nolock(&dumper, false, buf, sizeof(buf), &len)) { + while (kmsg_dump_get_line_nolock(&iter, false, buf, sizeof(buf), &len)) { buf[len] = '\0'; printf("%s", buf); } -- cgit v1.2.1