[PATCH v2 2/5] ia64: reuse append_elf_note() and final_note() functions
Dave Young
dyoung at redhat.com
Wed Nov 30 20:56:53 PST 2016
Hi Hari
Personally I like V1 more, but split the patch 2 is easier for ia64
people to reivew. I did basic x86 testing, it runs ok.
On 11/25/16 at 05:24pm, Hari Bathini wrote:
> Get rid of multiple definitions of append_elf_note() & final_note()
> functions. Reuse these functions compiled under CONFIG_CRASH_CORE.
>
> Signed-off-by: Hari Bathini <hbathini at linux.vnet.ibm.com>
> ---
> arch/ia64/kernel/crash.c | 22 ----------------------
> include/linux/crash_core.h | 4 ++++
> kernel/crash_core.c | 6 +++---
> kernel/kexec_core.c | 28 ----------------------------
> 4 files changed, 7 insertions(+), 53 deletions(-)
>
> diff --git a/arch/ia64/kernel/crash.c b/arch/ia64/kernel/crash.c
> index 2955f35..75859a0 100644
> --- a/arch/ia64/kernel/crash.c
> +++ b/arch/ia64/kernel/crash.c
> @@ -27,28 +27,6 @@ static int kdump_freeze_monarch;
> static int kdump_on_init = 1;
> static int kdump_on_fatal_mca = 1;
>
> -static inline Elf64_Word
> -*append_elf_note(Elf64_Word *buf, char *name, unsigned type, void *data,
> - size_t data_len)
> -{
> - struct elf_note *note = (struct elf_note *)buf;
> - note->n_namesz = strlen(name) + 1;
> - note->n_descsz = data_len;
> - note->n_type = type;
> - buf += (sizeof(*note) + 3)/4;
> - memcpy(buf, name, note->n_namesz);
> - buf += (note->n_namesz + 3)/4;
> - memcpy(buf, data, data_len);
> - buf += (data_len + 3)/4;
> - return buf;
> -}
> -
> -static void
> -final_note(void *buf)
> -{
> - memset(buf, 0, sizeof(struct elf_note));
> -}
> -
The above IA64 version looks better than the functions in kexec_core.c
about the Elf64_Word type usage and the simpler final_note function.
Care to update crash_core.c to use this instead?
Otherwise I'm fine with the changes.
> extern void ia64_dump_cpu_regs(void *);
>
> static DEFINE_PER_CPU(struct elf_prstatus, elf_prstatus);
> diff --git a/include/linux/crash_core.h b/include/linux/crash_core.h
> index 9a4f4b0..2ae20b1 100644
> --- a/include/linux/crash_core.h
> +++ b/include/linux/crash_core.h
> @@ -61,6 +61,10 @@ extern u32 vmcoreinfo_note[VMCOREINFO_NOTE_SIZE/4];
> extern size_t vmcoreinfo_size;
> extern size_t vmcoreinfo_max_size;
>
> +u32 *append_elf_note(u32 *buf, char *name, unsigned int type,
> + void *data, size_t data_len);
> +void final_note(u32 *buf);
> +
> int __init parse_crashkernel(char *cmdline, unsigned long long system_ram,
> unsigned long long *crash_size, unsigned long long *crash_base);
> int parse_crashkernel_high(char *cmdline, unsigned long long system_ram,
> diff --git a/kernel/crash_core.c b/kernel/crash_core.c
> index 60a98fc..9223976 100644
> --- a/kernel/crash_core.c
> +++ b/kernel/crash_core.c
> @@ -291,8 +291,8 @@ int __init parse_crashkernel_low(char *cmdline,
> "crashkernel=", suffix_tbl[SUFFIX_LOW]);
> }
>
> -static u32 *append_elf_note(u32 *buf, char *name, unsigned int type,
> - void *data, size_t data_len)
> +u32 *append_elf_note(u32 *buf, char *name, unsigned int type,
> + void *data, size_t data_len)
> {
> struct elf_note note;
>
> @@ -309,7 +309,7 @@ static u32 *append_elf_note(u32 *buf, char *name, unsigned int type,
> return buf;
> }
>
> -static void final_note(u32 *buf)
> +void final_note(u32 *buf)
> {
> struct elf_note note;
>
> diff --git a/kernel/kexec_core.c b/kernel/kexec_core.c
> index 3aa21f3..596cb32 100644
> --- a/kernel/kexec_core.c
> +++ b/kernel/kexec_core.c
> @@ -988,34 +988,6 @@ int crash_shrink_memory(unsigned long new_size)
> return ret;
> }
>
> -static u32 *append_elf_note(u32 *buf, char *name, unsigned type, void *data,
> - size_t data_len)
> -{
> - struct elf_note note;
> -
> - note.n_namesz = strlen(name) + 1;
> - note.n_descsz = data_len;
> - note.n_type = type;
> - memcpy(buf, ¬e, sizeof(note));
> - buf += (sizeof(note) + 3)/4;
> - memcpy(buf, name, note.n_namesz);
> - buf += (note.n_namesz + 3)/4;
> - memcpy(buf, data, note.n_descsz);
> - buf += (note.n_descsz + 3)/4;
> -
> - return buf;
> -}
> -
> -static void final_note(u32 *buf)
> -{
> - struct elf_note note;
> -
> - note.n_namesz = 0;
> - note.n_descsz = 0;
> - note.n_type = 0;
> - memcpy(buf, ¬e, sizeof(note));
> -}
> -
> void crash_save_cpu(struct pt_regs *regs, int cpu)
> {
> struct elf_prstatus prstatus;
>
>
> _______________________________________________
> kexec mailing list
> kexec at lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/kexec
Thanks
Dave
More information about the kexec
mailing list