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ARM: ep93xx: remove MaverickCrunch support

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The MaverickCrunch support for ep93xx never made it into glibc and
was removed from gcc in its 4.8 release in 2012. It is now one of
the last parts of arch/arm/ that fails to build with the clang
integrated assembler, which is unlikely to ever want to support it.

The two alternatives are to force the use of binutils/gas when
building the crunch support, or to remove it entirely.

According to Hartley Sweeten:

 "Martin Guy did a lot of work trying to get the maverick crunch working
  but I was never able to successfully use it for anything. It "kind"
  of works but depending on the EP93xx silicon revision there are still
  a number of hardware bugs that either give imprecise or garbage results.

  I have no problem with removing the kernel support for the maverick
  crunch."

Unless someone else comes up with a good reason to keep it around,
remove it now. This touches mostly the ep93xx platform, but removes
a bit of code from ARM common ptrace and signal frame handling as well.

If there are remaining users of MaverickCrunch, they can use LTS
kernels for at least another five years before kernel support ends.

Link: https://lore.kernel.org/linux-arm-kernel/20210802141245.1146772-1-arnd@kernel.org/
Link: https://lore.kernel.org/linux-arm-kernel/20210226164345.3889993-1-arnd@kernel.org/
Link: https://github.com/ClangBuiltLinux/linux/issues/1272
Link: https://gcc.gnu.org/legacy-ml/gcc/2008-03/msg01063.html
Cc: "Martin Guy" <martinwguy@martinwguy@gmail.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Arnd Bergmann
2021-02-27 13:40:09 +01:00
parent c500bee1c5
commit 12c3dca25d
25 changed files with 4 additions and 557 deletions
Download Patch File Download Diff File Expand all files Collapse all files

36
arch/arm/kernel/ptrace.c
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@@ -318,32 +318,6 @@ static int ptrace_setwmmxregs(struct task_struct *tsk, void __user *ufp)
#endif
#ifdef CONFIG_CRUNCH
/*
* Get the child Crunch state.
*/
static int ptrace_getcrunchregs(struct task_struct *tsk, void __user *ufp)
{
struct thread_info *thread = task_thread_info(tsk);
crunch_task_disable(thread); /* force it to ram */
return copy_to_user(ufp, &thread->crunchstate, CRUNCH_SIZE)
? -EFAULT : 0;
}
/*
* Set the child Crunch state.
*/
static int ptrace_setcrunchregs(struct task_struct *tsk, void __user *ufp)
{
struct thread_info *thread = task_thread_info(tsk);
crunch_task_release(thread); /* force a reload */
return copy_from_user(&thread->crunchstate, ufp, CRUNCH_SIZE)
? -EFAULT : 0;
}
#endif
#ifdef CONFIG_HAVE_HW_BREAKPOINT
/*
* Convert a virtual register number into an index for a thread_info
@@ -815,16 +789,6 @@ long arch_ptrace(struct task_struct *child, long request,
ret = 0;
break;
#ifdef CONFIG_CRUNCH
case PTRACE_GETCRUNCHREGS:
ret = ptrace_getcrunchregs(child, datap);
break;
case PTRACE_SETCRUNCHREGS:
ret = ptrace_setcrunchregs(child, datap);
break;
#endif
#ifdef CONFIG_VFP
case PTRACE_GETVFPREGS:
ret = copy_regset_to_user(child,