[PATCH 0/3] Add __ioread32_copy() and use it

[PATCH 0/3] Add __ioread32_copy() and use it · Stephen Boyd <hidden> · 2015-09-15
[PATCH 1/3] lib: iomap_copy: Add __ioread32_copy() · Stephen Boyd <hidden> · 2015-09-15
[PATCH 3/3] FIRMWARE: bcm47xx_nvram: Use __ioread32_copy() instead of open-coding · Stephen Boyd <hidden> · 2015-09-15
[PATCH 2/3] soc: qcom: smd: Use __ioread32_copy() instead of open-coding it · Stephen Boyd <hidden> · 2015-09-15
Re: [PATCH 0/3] Add __ioread32_copy() and use it · Andrew Morton <akpm@linux-foundation.org> · 2015-09-15
Re: [PATCH 0/3] Add __ioread32_copy() and use it · Stephen Boyd <hidden> · 2015-09-16
Re: [PATCH 0/3] Add __ioread32_copy() and use it · Andrew Morton <akpm@linux-foundation.org> · 2015-09-16
Re: [PATCH 0/3] Add __ioread32_copy() and use it · Andi Kleen <hidden> · 2015-09-16
Re: [PATCH 0/3] Add __ioread32_copy() and use it · Andrew Morton <akpm@linux-foundation.org> · 2015-09-16
Re: [PATCH 0/3] Add __ioread32_copy() and use it · Andi Kleen <hidden> · 2015-09-16
Re: [PATCH 0/3] Add __ioread32_copy() and use it · Andrew Morton <akpm@linux-foundation.org> · 2015-09-18
Re: [PATCH 0/3] Add __ioread32_copy() and use it · Andi Kleen <hidden> · 2015-09-19

From: akpm@linux-foundation.org (Andrew Morton)
Date: 2015-09-16 02:49:34
Also in: linux-arm-msm, linux-mips, lkml

On Wed, 16 Sep 2015 04:32:19 +0200 Andi Kleen [off-list ref] wrote:

quoted

__iowrite32_copy() is marked __visible.  I don't actually know what
that does and Andi's d47d5c8194579bc changelog (which sucks the big
one) didn't explain it.  Apparently it has something to do with being
implemented in assembly, but zillions of functions are implemented in
assembly, so why are only two functions marked this way?  Anyway,
__ioread32_copy() is implemented in C so I guess __visible isn't needed
there.

__visible is needed for C functions that are called from assembler.
Otherwise the compiler may optimize them away.

Under what circumstances will the compiler (or linker?) do this? 
LTO enabled?

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