On Thu, 11 Jul 2024 08:28:54 +0200
Mauro Carvalho Chehab <mchehab+huawei@xxxxxxxxxx> wrote:
> Sometimes it is desired to produce a single log line for errors.
> Add a new helper function for such purpose.
>
> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@xxxxxxxxxx>
LGTM
Reviewed-by; Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
> ---
> drivers/firmware/efi/cper.c | 43 +++++++++++++++++++++++++++++++++++++
> include/linux/cper.h | 2 ++
> 2 files changed, 45 insertions(+)
>
> diff --git a/drivers/firmware/efi/cper.c b/drivers/firmware/efi/cper.c
> index 7d2cdd9e2227..462d739e8dd1 100644
> --- a/drivers/firmware/efi/cper.c
> +++ b/drivers/firmware/efi/cper.c
> @@ -106,6 +106,49 @@ void cper_print_bits(const char *pfx, unsigned int bits,
> printk("%s\n", buf);
> }
>
> +/**
> + * cper_bits_to_str - return a string for set bits
> + * @buf: buffer to store the output string
> + * @buf_size: size of the output string buffer
> + * @bits: bit mask
> + * @strs: string array, indexed by bit position
> + * @strs_size: size of the string array: @strs
> + *
> + * Add to @buf the bitmask in hexadecimal. Then, for each set bit in @bits,
> + * add the corresponding string describing the bit in @strs to @buf.
> + *
> + * Return: number of bytes stored or an error code if lower than zero.
> + */
> +int cper_bits_to_str(char *buf, int buf_size, unsigned long bits,
> + const char * const strs[], unsigned int strs_size)
> +{
> + int len = buf_size;
> + char *str = buf;
> + int i, size;
> +
> + *buf = '\0';
> +
> + for_each_set_bit(i, &bits, strs_size) {
> + if (!(bits & (1U << (i))))
> + continue;
> +
> + if (*buf && len > 0) {
> + *str = '|';
> + len--;
> + str++;
> + }
> +
> + size = strscpy(str, strs[i], len);
> + if (size < 0)
> + return size;
> +
> + len -= size;
> + str += size;
> + }
> + return len - buf_size;
> +}
> +EXPORT_SYMBOL_GPL(cper_bits_to_str);
> +
> static const char * const proc_type_strs[] = {
> "IA32/X64",
> "IA64",
> diff --git a/include/linux/cper.h b/include/linux/cper.h
> index 265b0f8fc0b3..25858a7608b7 100644
> --- a/include/linux/cper.h
> +++ b/include/linux/cper.h
> @@ -584,6 +584,8 @@ const char *cper_mem_err_type_str(unsigned int);
> const char *cper_mem_err_status_str(u64 status);
> void cper_print_bits(const char *prefix, unsigned int bits,
> const char * const strs[], unsigned int strs_size);
> +int cper_bits_to_str(char *buf, int buf_size, unsigned long bits,
> + const char * const strs[], unsigned int strs_size);
> void cper_mem_err_pack(const struct cper_sec_mem_err *,
> struct cper_mem_err_compact *);
> const char *cper_mem_err_unpack(struct trace_seq *,
