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powerpc/pseries/papr-sysparm: use u8 arrays for payloads

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Some PAPR system parameter values are formatted by firmware as
nul-terminated strings (e.g. LPAR name, shared processor attributes).
But the values returned for other parameters, such as processor module
info and TLB block invalidate characteristics, are binary data with
parameter-specific layouts. So char[] isn't the appropriate type for
the general case. Use u8/__u8.

Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com>
Fixes: 905b9e4878 ("powerpc/pseries/papr-sysparm: Expose character device to user space")
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20240202-papr-sysparm-ioblock-data-use-u8-v1-1-f5c6c89f65ec@linux.ibm.com
This commit is contained in:
Nathan Lynch 2024-02-02 18:26:46 -06:00 • committed by Michael Ellerman
parent 41bccc98fb
commit 8ded03ae48
2 changed files with 2 additions and 2 deletions
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2
arch/powerpc/include/asm/papr-sysparm.h
View file

@ -32,7 +32,7 @@ typedef struct {
*/
struct papr_sysparm_buf {
__be16 len;
char val[PAPR_SYSPARM_MAX_OUTPUT];
u8 val[PAPR_SYSPARM_MAX_OUTPUT];
};
struct papr_sysparm_buf *papr_sysparm_buf_alloc(void);

2
arch/powerpc/include/uapi/asm/papr-sysparm.h
View file

@ -14,7 +14,7 @@ enum {
struct papr_sysparm_io_block {
__u32 parameter;
__u16 length;
char data[PAPR_SYSPARM_MAX_OUTPUT];
__u8 data[PAPR_SYSPARM_MAX_OUTPUT];
};
/**