pthread_create.3: Re-do the architecture/default stack size mapping

Currently, the page lists 2 of the 3 x86 architectures, no ARM(!),
old PowerPC only, and most egregiously itanium,
which linux doesn't target.

Per glibc 2.38:
  $ git grep ARCH_STACK_DEFAULT_SIZE
  aarch64     #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
  arc         #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
  arm         #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
  csky        #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
  loongarch   #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
  m68k        #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
  microblaze  #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
  mips        #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
  nios2       #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
  or1k        #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
  riscv       #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
  s390        #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
  sh          #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
  sparc32     #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)
  x86         #define ARCH_STACK_DEFAULT_SIZE  (2 * 1024 * 1024)

  alpha       #define ARCH_STACK_DEFAULT_SIZE  (4 * 1024 * 1024)
  powerpc     #define ARCH_STACK_DEFAULT_SIZE  (4 * 1024 * 1024)
  sparc64     #define ARCH_STACK_DEFAULT_SIZE  (4 * 1024 * 1024)

  hppa        #define ARCH_STACK_DEFAULT_SIZE  (8 * 1024 * 1024)

  ia64        #define ARCH_STACK_DEFAULT_SIZE (32 * 1024 * 1024)

I cut PA-RISC and the Alpha. They have 10 and 6 popcon entries,
respectively, and AFAICT they haven't seen a processor released
in over a decade, they aren't relevant to any modern reader.

Similarly, use "POWER" instead of "PowerPC" ‒ the consensus branding
is "POWER"+version (POWER8/POWER9); PowerPC is itself a POWER variant
and doesn't really deserve its own special mention, especially in 2024.

Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Signed-off-by: Alejandro Colomar <alx@kernel.org>

1 files changed, 2 insertions, 17 deletions

diff --git a/man3/pthread_create.3 b/man3/pthread_create.3
index 66c67a6ff3..fd6253bf44 100644
--- a/man3/pthread_create.3
+++ b/man3/pthread_create.3
@@ -200,23 +200,8 @@ in order to obtain a stack size other than the default.
 If the
 .B RLIMIT_STACK
 resource limit is set to "unlimited",
-a per-architecture value is used for the stack size.
-Here is the value for a few architectures:
-.RS
-.TS
-allbox;
-lb lb
-l r.
-Architecture	Default stack size
-i386	2 MB
-IA-64	32 MB
-PowerPC	4 MB
-S/390	2 MB
-Sparc-32	2 MB
-Sparc-64	4 MB
-x86_64	2 MB
-.TE
-.RE
+a per-architecture value is used for the stack size:
+2 MB on most architectures; 4 MB on POWER and Sparc-64.
 .SH BUGS
 In the obsolete LinuxThreads implementation,
 each of the threads in a process has a different process ID.