Because CONFIG_STRICT_KERNEL_RWX=n cannot be set by make menuconfig on arm64/x86/s390 architecture So, these three patches should not be necessary Sorry to disturb everyone Thank you for your guidance Thanks -----Original Message----- From: Mark Rutland [mailto:mark.rutland@xxxxxxx] Sent: Wednesday, May 30, 2018 4:08 PM To: Nixiaoming <nixiaoming@xxxxxxxxxx> Cc: Will Deacon <will.deacon@xxxxxxx>; catalin.marinas@xxxxxxx; ard.biesheuvel@xxxxxxxxxx; marc.zyngier@xxxxxxx; james.morse@xxxxxxx; kristina.martsenko@xxxxxxx; steve.capper@xxxxxxx; tglx@xxxxxxxxxxxxx; mingo@xxxxxxxxxx; hpa@xxxxxxxxx; akpm@xxxxxxxxxxxxxxxxxxxx; vbabka@xxxxxxx; mhocko@xxxxxxxx; dave.hansen@xxxxxxxxxxxxxxx; dan.j.williams@xxxxxxxxx; kirill.shutemov@xxxxxxxxxxxxxxx; zhang.jia@xxxxxxxxxxxxxxxxx; schwidefsky@xxxxxxxxxx; heiko.carstens@xxxxxxxxxx; gregkh@xxxxxxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx; x86@xxxxxxxxxx; linux-s390@xxxxxxxxxxxxxxx Subject: Re: [PATCH 1/3] arm64:add missing CONFIG_STRICT_KERNEL_RWX for mark_rodata_ro On Wed, May 30, 2018 at 03:31:38AM +0000, Nixiaoming wrote: > Unable to set CONFIG_STRICT_KERNEL_RWX=n by make menuconfig ARCH=arm64 Indeed. Making this mandatory was a deliberate decision, in part because this allows simplification of code (e.g. removal of #ifdef guards). > When reading the code, I feel it is more appropriate to add macro control > here. I must disagree. I do not think it makes sense to add an #ifdef for a configuration option that is mandatory. There are other places in the kernel that should behave differently if CONFIG_STRICT_KERNEL_RWX were disabled, so this wouldn't be sufficient even if we were to make CONFIG_STRICT_KERNEL_RWX optional. i.e. the #ifdef would give the misleading impression that STRICT_KERNEL_RWX *could* be made optional, even though this might not function correctly. Having an #ifdef here makes the code more complicated and confusing, for the benefit of a case which cannot occur. Thanks, Mark. > -----Original Message----- > From: Will Deacon [mailto:will.deacon@xxxxxxx] > Sent: Tuesday, May 29, 2018 11:45 PM > To: Nixiaoming <nixiaoming@xxxxxxxxxx> > Cc: catalin.marinas@xxxxxxx; ard.biesheuvel@xxxxxxxxxx; marc.zyngier@xxxxxxx; james.morse@xxxxxxx; kristina.martsenko@xxxxxxx; steve.capper@xxxxxxx; tglx@xxxxxxxxxxxxx; mingo@xxxxxxxxxx; hpa@xxxxxxxxx; akpm@xxxxxxxxxxxxxxxxxxxx; vbabka@xxxxxxx; mhocko@xxxxxxxx; dave.hansen@xxxxxxxxxxxxxxx; dan.j.williams@xxxxxxxxx; kirill.shutemov@xxxxxxxxxxxxxxx; zhang.jia@xxxxxxxxxxxxxxxxx; schwidefsky@xxxxxxxxxx; heiko.carstens@xxxxxxxxxx; gregkh@xxxxxxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx; x86@xxxxxxxxxx; linux-s390@xxxxxxxxxxxxxxx > Subject: Re: [PATCH 1/3] arm64:add missing CONFIG_STRICT_KERNEL_RWX for mark_rodata_ro > > On Tue, May 29, 2018 at 09:36:15PM +0800, nixiaoming wrote: > > mark_rodata_ro is only called by the function mark_readonly when > > CONFIG_STRICT_KERNEL_RWX=y, > > if CONFIG_STRICT_KERNEL_RWX is not set > > a compile warning may be triggered: unused function > > How are you achieving this configuration? In our Kconfig we select this > unconditionally. > > Will -- To unsubscribe from this list: send the line "unsubscribe linux-s390" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
