Re: [PATCH 07/15] parisc: use generic sys_fanotify_mark implementation
From: John David Anglin
Date: Fri Jun 21 2024 - 08:32:48 EST
On 2024-06-21 4:54 a.m., John Paul Adrian Glaubitz wrote:
Hi,
On Fri, 2024-06-21 at 08:28 +0200, Arnd Bergmann wrote:
It's more likely to be related to the upward growing stack.
I checked the gcc sources and found that out of the 50 supported
architectures, ARGS_GROW_DOWNWARD is set on everything except
for gcn, stormy16 and 32-bit parisc. The other two are
little-endian though. STACK_GROWS_DOWNWARD in turn is set on
everything other than parisc (both 32-bit and 64-bit).
Wait a second! Does that mean that on 64-bit PA-RISC, the stack is
actually growing downwards? If yes, that would be a strong argument
for creating a 64-bit PA-RISC port in Debian and replacing the 32-bit
port.
No, the stack grows upward on both 32 and 64-bit parisc. But stack arguments
grow upwards on 64-bit parisc. The argument pointer is needed to access these
arguments. In 32-bit parisc, the argument pointer is at a fixed offset relative to the
stack pointer and it can be eliminated.
Dave
--
John David Anglin dave.anglin@xxxxxxxx