Messages in this thread | | | Date | Tue, 18 May 2021 18:32:43 -0400 (EDT) | From | Nicolas Pitre <> | Subject | Re: [PATCH 3/4] ARM: change vmalloc_min to vmalloc_start |
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On Tue, 18 May 2021, Nicolas Pitre wrote:
> On Wed, 19 May 2021, Linus Walleij wrote: > > > On Tue, May 18, 2021 at 2:15 PM Russell King (Oracle) > > <rmk+kernel@armlinux.org.uk> wrote: > > > > > Change the current vmalloc_min, which is supposed to be the lowest > > > address of vmalloc space including the VMALLOC_OFFSET, to vmalloc_start > > > which does not include VMALLOC_OFFSET. > > > > > > Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk> > > > > Reviewed-by: Linus Walleij <linus.walleij@linaro.org> > > > > > +static unsigned long __initdata vmalloc_start = VMALLOC_END - (240 << 20); > > > > When I first read this it took me some time to figure out what was > > going on here, so if you have time, please fold in a comment > > with some explanation of that (240 << 20) thing, in some blog > > post I described it as "an interesting way to write 0x0f000000" > > but I suppose commit 0536bdf33faf chose this way for a > > specific reason? (Paging Nico if he can explain it.) > > That's an alternative (and deprecated) way to write MB(240).
And it seems that MB() isn't globally defined either. Oh well.
Nicolas
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