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Sane printk changes for 5.20

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Merge tag 'printk-for-5.20-sane' of git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux

Pull printk updates from Petr Mladek:

 - Allow reading kernel log in gdb even on 32 bits systems

 - More granular check of the buffer usage in printf selftest

 - Clang warning fix

* tag 'printk-for-5.20-sane' of git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux:
  lib/test_printf.c: fix clang -Wformat warnings
  scripts/gdb: fix 'lx-dmesg' on 32 bits arch
  lib/test_printf.c: split write-beyond-buffer check in two
This commit is contained in:
Linus Torvalds 2022-08-05 09:54:36 -07:00
commit a1b02751d6
3 changed files with 32 additions and 12 deletions
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9
scripts/gdb/linux/dmesg.py
View file

@ -22,7 +22,6 @@ prb_desc_type = utils.CachedType("struct prb_desc")
prb_desc_ring_type = utils.CachedType("struct prb_desc_ring")
prb_data_ring_type = utils.CachedType("struct prb_data_ring")
printk_ringbuffer_type = utils.CachedType("struct printk_ringbuffer")
atomic_long_type = utils.CachedType("atomic_long_t")
class LxDmesg(gdb.Command):
"""Print Linux kernel log buffer."""
@ -68,8 +67,6 @@ class LxDmesg(gdb.Command):
off = prb_data_ring_type.get_type()['data'].bitpos // 8
text_data_addr = utils.read_ulong(text_data_ring, off)
counter_off = atomic_long_type.get_type()['counter'].bitpos // 8
sv_off = prb_desc_type.get_type()['state_var'].bitpos // 8
off = prb_desc_type.get_type()['text_blk_lpos'].bitpos // 8
@ -89,9 +86,9 @@ class LxDmesg(gdb.Command):
# read in tail and head descriptor ids
off = prb_desc_ring_type.get_type()['tail_id'].bitpos // 8
tail_id = utils.read_u64(desc_ring, off + counter_off)
tail_id = utils.read_atomic_long(desc_ring, off)
off = prb_desc_ring_type.get_type()['head_id'].bitpos // 8
head_id = utils.read_u64(desc_ring, off + counter_off)
head_id = utils.read_atomic_long(desc_ring, off)
did = tail_id
while True:
@ -102,7 +99,7 @@ class LxDmesg(gdb.Command):
desc = utils.read_memoryview(inf, desc_addr + desc_off, desc_sz).tobytes()
# skip non-committed record
state = 3 & (utils.read_u64(desc, sv_off + counter_off) >> desc_flags_shift)
state = 3 & (utils.read_atomic_long(desc, sv_off) >> desc_flags_shift)
if state != desc_committed and state != desc_finalized:
if did == head_id:
break

14
scripts/gdb/linux/utils.py
View file

@ -35,13 +35,12 @@ class CachedType:
long_type = CachedType("long")
atomic_long_type = CachedType("atomic_long_t")
def get_long_type():
global long_type
return long_type.get_type()
def offset_of(typeobj, field):
element = gdb.Value(0).cast(typeobj)
return int(str(element[field].address).split()[0], 16)
@ -129,6 +128,17 @@ def read_ulong(buffer, offset):
else:
return read_u32(buffer, offset)
atomic_long_counter_offset = atomic_long_type.get_type()['counter'].bitpos
atomic_long_counter_sizeof = atomic_long_type.get_type()['counter'].type.sizeof
def read_atomic_long(buffer, offset):
global atomic_long_counter_offset
global atomic_long_counter_sizeof
if atomic_long_counter_sizeof == 8:
return read_u64(buffer, offset + atomic_long_counter_offset)
else:
return read_u32(buffer, offset + atomic_long_counter_offset)
target_arch = None