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scripts/gdb/symbols: factor out pagination_off()

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Move the code that turns off pagination into a separate function.  It will
be useful later in order to prevent hangs when loading symbols for kernel
image in physical memory during s390 early boot.

Link: https://lkml.kernel.org/r/20250515155811.114392-3-iii@linux.ibm.com
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Kieran Bingham <kbingham@kernel.org>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Ilya Leoshkevich
2025-05-15 17:52:12 +02:00
committed by Andrew Morton
parent 3545414f25
commit e97c4a27cb
2 changed files with 18 additions and 13 deletions
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20
scripts/gdb/linux/symbols.py
View File

@@ -38,19 +38,13 @@ if hasattr(gdb, 'Breakpoint'):
# Disable pagination while reporting symbol (re-)loading.
# The console input is blocked in this context so that we would
# get stuck waiting for the user to acknowledge paged output.
show_pagination = gdb.execute("show pagination", to_string=True)
pagination = show_pagination.endswith("on.\n")
gdb.execute("set pagination off")
if module_name in cmd.loaded_modules:
gdb.write("refreshing all symbols to reload module "
"'{0}'\n".format(module_name))
cmd.load_all_symbols()
else:
cmd.load_module_symbols(module)
# restore pagination state
gdb.execute("set pagination %s" % ("on" if pagination else "off"))
with utils.pagination_off():
if module_name in cmd.loaded_modules:
gdb.write("refreshing all symbols to reload module "
"'{0}'\n".format(module_name))
cmd.load_all_symbols()
else:
cmd.load_module_symbols(module)
return False

11
scripts/gdb/linux/utils.py
View File

@@ -260,3 +260,14 @@ def get_vmlinux():
obj.filename.endswith('vmlinux.debug')):
vmlinux = obj.filename
return vmlinux
@contextlib.contextmanager
def pagination_off():
show_pagination = gdb.execute("show pagination", to_string=True)
pagination = show_pagination.endswith("on.\n")
gdb.execute("set pagination off")
try:
yield
finally:
gdb.execute("set pagination %s" % ("on" if pagination else "off"))