[PATCH 5.10 034/243] partitions: msdos: fix one-byte get_unaligned()

Greg Kroah-Hartman
2021-07-19T17:08:27Z

From: Arnd Bergmann <arnd@arndb.de>

[ Upstream commit 1b1774998b2dec837a57d729d1a22e5eb2d6d206 ]

A simplification of get_unaligned() clashes with callers that pass
in a character pointer, causing a harmless warning like:

block/partitions/msdos.c: In function 'msdos_partition':
include/asm-generic/unaligned.h:13:22: warning: 'packed' attribute ignored for field of type 'u8' {aka 'unsigned char'} [-Wattributes]

Remove the SYS_IND() macro with the get_unaligned() call
and just use the ->ind field directly.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
block/partitions/ldm.c | 2 +-
block/partitions/ldm.h | 3 ---
block/partitions/msdos.c | 24 +++++++++++-------------
3 files changed, 12 insertions(+), 17 deletions(-)

diff --git a/block/partitions/ldm.c b/block/partitions/ldm.c
index d333786b5c7e..cc86534c80ad 100644
--- a/block/partitions/ldm.c
+++ b/block/partitions/ldm.c
@@ -510,7 +510,7 @@ static bool ldm_validate_partition_table(struct parsed_partitions *state)

p = (struct msdos_partition *)(data + 0x01BE);
for (i = 0; i < 4; i++, p++)
- if (SYS_IND (p) == LDM_PARTITION) {
+ if (p->sys_ind == LDM_PARTITION) {
result = true;
break;
}
diff --git a/block/partitions/ldm.h b/block/partitions/ldm.h
index d8d6beaa72c4..8693704dcf5e 100644
--- a/block/partitions/ldm.h
+++ b/block/partitions/ldm.h
@@ -84,9 +84,6 @@ struct parsed_partitions;
#define TOC_BITMAP1 "config" /* Names of the two defined */
#define TOC_BITMAP2 "log" /* bitmaps in the TOCBLOCK. */

-/* Borrowed from msdos.c */
-#define SYS_IND(p) (get_unaligned(&(p)->sys_ind))
-
struct frag { /* VBLK Fragment handling */
struct list_head list;
u32 group;
diff --git a/block/partitions/msdos.c b/block/partitions/msdos.c
index 8f2fcc080264..c94de377c502 100644
--- a/block/partitions/msdos.c
+++ b/block/partitions/msdos.c
@@ -38,8 +38,6 @@
*/
#include <asm/unaligned.h>

-#define SYS_IND(p) get_unaligned(&p->sys_ind)
-
static inline sector_t nr_sects(struct msdos_partition *p)
{
return (sector_t)get_unaligned_le32(&p->nr_sects);
@@ -52,9 +50,9 @@ static inline sector_t start_sect(struct msdos_partition *p)

static inline int is_extended_partition(struct msdos_partition *p)
{
- return (SYS_IND(p) == DOS_EXTENDED_PARTITION ||
- SYS_IND(p) == WIN98_EXTENDED_PARTITION ||
- SYS_IND(p) == LINUX_EXTENDED_PARTITION);
+ return (p->sys_ind == DOS_EXTENDED_PARTITION ||
+ p->sys_ind == WIN98_EXTENDED_PARTITION ||
+ p->sys_ind == LINUX_EXTENDED_PARTITION);
}

#define MSDOS_LABEL_MAGIC1 0x55
@@ -193,7 +191,7 @@ static void parse_extended(struct parsed_partitions *state,

put_partition(state, state->next, next, size);
set_info(state, state->next, disksig);
- if (SYS_IND(p) == LINUX_RAID_PARTITION)
+ if (p->sys_ind == LINUX_RAID_PARTITION)
state->parts[state->next].flags = ADDPART_FLAG_RAID;
loopct = 0;
if (++state->next == state->limit)
@@ -546,7 +544,7 @@ static void parse_minix(struct parsed_partitions *state,
* a secondary MBR describing its subpartitions, or
* the normal boot sector. */
if (msdos_magic_present(data + 510) &&
- SYS_IND(p) == MINIX_PARTITION) { /* subpartition table present */
+ p->sys_ind == MINIX_PARTITION) { /* subpartition table present */
char tmp[1 + BDEVNAME_SIZE + 10 + 9 + 1];

snprintf(tmp, sizeof(tmp), " %s%d: <minix:", state->name, origin);
@@ -555,7 +553,7 @@ static void parse_minix(struct parsed_partitions *state,
if (state->next == state->limit)
break;
/* add each partition in use */
- if (SYS_IND(p) == MINIX_PARTITION)
+ if (p->sys_ind == MINIX_PARTITION)
put_partition(state, state->next++,
start_sect(p), nr_sects(p));
}
@@ -643,7 +641,7 @@ int msdos_partition(struct parsed_partitions *state)
p = (struct msdos_partition *) (data + 0x1be);
for (slot = 1 ; slot <= 4 ; slot++, p++) {
/* If this is an EFI GPT disk, msdos should ignore it. */
- if (SYS_IND(p) == EFI_PMBR_OSTYPE_EFI_GPT) {
+ if (p->sys_ind == EFI_PMBR_OSTYPE_EFI_GPT) {
put_dev_sector(sect);
return 0;
}
@@ -685,11 +683,11 @@ int msdos_partition(struct parsed_partitions *state)
}
put_partition(state, slot, start, size);
set_info(state, slot, disksig);
- if (SYS_IND(p) == LINUX_RAID_PARTITION)
+ if (p->sys_ind == LINUX_RAID_PARTITION)
state->parts[slot].flags = ADDPART_FLAG_RAID;
- if (SYS_IND(p) == DM6_PARTITION)
+ if (p->sys_ind == DM6_PARTITION)
strlcat(state->pp_buf, "[DM]", PAGE_SIZE);
- if (SYS_IND(p) == EZD_PARTITION)
+ if (p->sys_ind == EZD_PARTITION)
strlcat(state->pp_buf, "[EZD]", PAGE_SIZE);
}

@@ -698,7 +696,7 @@ int msdos_partition(struct parsed_partitions *state)
/* second pass - output for each on a separate line */
p = (struct msdos_partition *) (0x1be + data);
for (slot = 1 ; slot <= 4 ; slot++, p++) {
- unsigned char id = SYS_IND(p);
+ unsigned char id = p->sys_ind;
int n;

if (!nr_sects(p))
--
2.30.2