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Date: Sat, 23 Sep 2023 18:38:08 +0300
From: Mike Rapoport <rppt@kernel.org>
To: Song Liu <song@kernel.org>
Cc: linux-kernel@vger.kernel.org, Andrew Morton <akpm@linux-foundation.org>,
	=?iso-8859-1?Q?Bj=F6rn_T=F6pel?= <bjorn@kernel.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Christophe Leroy <christophe.leroy@csgroup.eu>,
	"David S. Miller" <davem@davemloft.net>,
	Dinh Nguyen <dinguyen@kernel.org>,
	Heiko Carstens <hca@linux.ibm.com>, Helge Deller <deller@gmx.de>,
	Huacai Chen <chenhuacai@kernel.org>,
	Kent Overstreet <kent.overstreet@linux.dev>,
	Luis Chamberlain <mcgrof@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Michael Ellerman <mpe@ellerman.id.au>,
	Nadav Amit <nadav.amit@gmail.com>,
	"Naveen N. Rao" <naveen.n.rao@linux.ibm.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Puranjay Mohan <puranjay12@gmail.com>,
	Rick Edgecombe <rick.p.edgecombe@intel.com>,
	Russell King <linux@armlinux.org.uk>,
	Steven Rostedt <rostedt@goodmis.org>,
	Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
	Thomas Gleixner <tglx@linutronix.de>, Will Deacon <will@kernel.org>,
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Subject: Re: [PATCH v3 02/13] mm: introduce execmem_text_alloc() and
 execmem_free()
Message-ID: <20230923153808.GI3303@kernel.org>
References: <20230918072955.2507221-1-rppt@kernel.org>
 <20230918072955.2507221-3-rppt@kernel.org>
 <CAPhsuW5-=H1V=VXUYxyGnUdJuNUpRt44QmpwjkDUD=9i0itjuw@mail.gmail.com>
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In-Reply-To: <CAPhsuW5-=H1V=VXUYxyGnUdJuNUpRt44QmpwjkDUD=9i0itjuw@mail.gmail.com>

On Thu, Sep 21, 2023 at 03:34:18PM -0700, Song Liu wrote:
> On Mon, Sep 18, 2023 at 12:30 AM Mike Rapoport <rppt@kernel.org> wrote:
> >
> 
> [...]
> 
> > diff --git a/arch/s390/kernel/module.c b/arch/s390/kernel/module.c
> > index 42215f9404af..db5561d0c233 100644
> > --- a/arch/s390/kernel/module.c
> > +++ b/arch/s390/kernel/module.c
> > @@ -21,6 +21,7 @@
> >  #include <linux/moduleloader.h>
> >  #include <linux/bug.h>
> >  #include <linux/memory.h>
> > +#include <linux/execmem.h>
> >  #include <asm/alternative.h>
> >  #include <asm/nospec-branch.h>
> >  #include <asm/facility.h>
> > @@ -76,7 +77,7 @@ void *module_alloc(unsigned long size)
> >  #ifdef CONFIG_FUNCTION_TRACER
> >  void module_arch_cleanup(struct module *mod)
> >  {
> > -       module_memfree(mod->arch.trampolines_start);
> > +       execmem_free(mod->arch.trampolines_start);
> >  }
> >  #endif
> >
> > @@ -510,7 +511,7 @@ static int module_alloc_ftrace_hotpatch_trampolines(struct module *me,
> >
> >         size = FTRACE_HOTPATCH_TRAMPOLINES_SIZE(s->sh_size);
> >         numpages = DIV_ROUND_UP(size, PAGE_SIZE);
> > -       start = module_alloc(numpages * PAGE_SIZE);
> > +       start = execmem_text_alloc(EXECMEM_FTRACE, numpages * PAGE_SIZE);
> 
> This should be EXECMEM_MODULE_TEXT?

This is an ftrace trampoline, so I think it should be FTRACE type of
allocation.
 
> Thanks,
> Song
> 
> >         if (!start)
> >                 return -ENOMEM;
> >         set_memory_rox((unsigned long)start, numpages);
> [...]

-- 
Sincerely yours,
Mike.