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SubjectRe: [v5 4/6] extable: Add function to search only kernel exception table
Santosh Sivaraj's on July 9, 2019 10:15 pm:
> In real mode, the search_exception tables cannot be called because
> it also searches the module exception tables if entry is not found
> in the kernel exception tables.

This is a patch for generic kernel code, it may not go through
powerpc tree and someone doing git blame or something won't have
any idea what this changelog means.

Can you re-word this and just say something like, "certain architecture
$specific operating modes (e.g., in powerpc machine check handler that
is unable to access vmalloc memory)."

>
> Cc: Thomas Gleixner <tglx@linutronix.de>
> Cc: Ingo Molnar <mingo@kernel.org>
> Cc: Nicholas Piggin <npiggin@gmail.com>
> Signed-off-by: Santosh Sivaraj <santosh@fossix.org>
> ---
> include/linux/extable.h | 2 ++
> kernel/extable.c | 16 +++++++++++++---
> 2 files changed, 15 insertions(+), 3 deletions(-)
>
> diff --git a/include/linux/extable.h b/include/linux/extable.h
> index 41c5b3a25f67..0c2819ba67f0 100644
> --- a/include/linux/extable.h
> +++ b/include/linux/extable.h
> @@ -19,6 +19,8 @@ void trim_init_extable(struct module *m);
>
> /* Given an address, look for it in the exception tables */
> const struct exception_table_entry *search_exception_tables(unsigned long add);
> +const struct
> +exception_table_entry *search_kernel_exception_table(unsigned long addr);
>
> #ifdef CONFIG_MODULES
> /* For extable.c to search modules' exception tables. */
> diff --git a/kernel/extable.c b/kernel/extable.c
> index e23cce6e6092..6d544cb79fff 100644
> --- a/kernel/extable.c
> +++ b/kernel/extable.c
> @@ -40,13 +40,23 @@ void __init sort_main_extable(void)
> }
> }
>
> -/* Given an address, look for it in the exception tables. */
> +/* For the given address, look for it in the kernel exception table */

Nitpick, no reason to vary the structure of the comment.

Code wise it looks fine, so with the comments and changelog fixed,

Reviewed-by: Nicholas Piggin <npiggin@gmail.com>

> +const
> +struct exception_table_entry *search_kernel_exception_table(unsigned long addr)
> +{
> + return search_extable(__start___ex_table,
> + __stop___ex_table - __start___ex_table, addr);
> +}
> +
> +/*
> + * Given an address, look for it in the kernel and the module exception
> + * tables.
> + */
> const struct exception_table_entry *search_exception_tables(unsigned long addr)
> {
> const struct exception_table_entry *e;
>
> - e = search_extable(__start___ex_table,
> - __stop___ex_table - __start___ex_table, addr);
> + e = search_kernel_exception_table(addr);
> if (!e)
> e = search_module_extables(addr);
> return e;
> --
> 2.20.1
>
>

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