Le 29/07/2025 à 21:49, Colin King (gmail) a écrit :
On 29/07/2025 18:45, Christophe JAILLET wrote:
Le 29/07/2025 à 08:49, Colin Ian King a écrit :
Don't populate the read-only arrays on the stack at run time, instead
make them static const. Also reduces overall size.
before:
text data bss dec hex filename
367439 89582 5952 462973 7107d drivers/scsi/
scsi_debug.o
after:
text data bss dec hex filename
365847 90702 5952 462501 70ea5 drivers/scsi/
scsi_debug.o
Hi,
out of curiosity, any idea why 'data' increase?
Because the arrays are being stored in the data section rather than on
the stack.
Even when const is used?
See [1] for example, adding const moves the size from data to text.
I would expect the same with your patch.
CJ
[1]:
https://web.git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=86b0fc4b2b45a78cbdc11873bc596d140eff390c
All my constification patches lead to data reduction.
(gcc 14.2.0, x86-64)
(same kind of behavior with 15.1.1)
CJ
